Self-closing check valve



May 26, 1925.

C. MELDAU SELF CLOSING CHECK VALVE Filed Sept. 25, 1922 lNvENTbR BY 4 ATTORNEYSE S Patented May 26, 1925.

UNITED sTrEs CHARLES Murnau,

` senr-CLOSING Application filed September To aZZ whoa/1. t may concern.-

Be it known that l, CHARLES MnLuAU, a citizen of the United States, residing at New York, in the county oit Bronx and State o1 New York, havemade a certain new and useful Invention in Self-Closing Check Valves, of which the 'following is s specilication.

My invention relates more particularly to improvements in high pressure check valves, and includes in its objects the production ot a seit-closing valve structure which is reliable in operation, simple and rugll'cd in construction, and which is op erable 'from any desired point distant trom the. valve; another object. includes the pro4 vision of a valve structure which may be readily inspected without disassembling the valve proper and wherein the valve seat is without the valve body; a furtl'ier object embraces a valve construction ywherein the valve will open and close in straight line movements, that is, the valve head will be cc'instantly reseated in substantially the same position, and no turning or twisting movements will be given to the valve stem or valve head in opening and closing; a still. further object embaces a valve construction wherein the valve releasing part pro tccts the valve holding part and is separable therefrom without opening the valve or impair-ing its effectiveness.

Other objects will appear hereinafter', and l attain these objects by the construction. illustrated in the accompanying drawing, in which j i Fig. 1 is a view in elevation showing the valve litted -to the neck of any suitable gas container `liig. Q is 2-2 or" Fig. 1;

l? 3 is a sectional view taken on lines .3*3 of L); and

Fig. 4 is a sectional view of one form ot extension tor operating the valve at a distance and to thus deliver the gas.

Like numerals refer to similar parts throughout the several views.

In the form herein illustrated as an e3;- ample merely ot an embodiment of one torni ott' my invention, the valve holding part or essential valve body comprises an enlarged nut head 11, and a screw threaded stem 12. A bore extends cent ally through the valve body, and the lower part of this a sectional view taken on lines 1,539,054 r.avisarl ortica.4

CHECK VALVE.

23,` 1922. Serial No. 589,866.

bore is enlarged into a screw threaded rc- Cess for engaging a valve plug 13. Thisv is opened. It will be observed that the valvef stem -16 `is provided with bearing surfaces 22 for engaging the sides of the bore through the threaded steml.

Nithin the nut head and surrounding' the valve nut 1.9, is a screw threaded recess, which forms sea-t for the threaded er1-- tension 24 et casing 23 ot the valve releasing part and operating' member. The eX- tension 24 of said member is rigidly screwed into vsaid recess and `tits securely against the shoulder seat 25 ot the nut head. Casing 23 is providedvf'ith a central bore 2G for receiving the valve releasingballs 27 and the pressure disk 28. Bore 2G terminates in an enlarged mouth with a restricted neck 29 against the shoulders of which the pressure disk is loosely held when the valve is closed. rThe mouth end of casing 23 is provided with screw threads 30 torreceiving a sealing cap 31, or for attaching a gas releasing` and control coupling nut 31', or its equivalent connection coupling 3G. The sealing cap may be rotatively held ina collar 32 by means of a chain 33, which is fastened to a protective projection 34 ot casing 23.

A channel 35 within bore Q6 provides tor a free passage of the gas. This channel communicates, through slot 37 in the pressure disk 28, with a central bore 38 in said disk, and forms an unobstructed gas passage. Vhen it is desired to open the valve to obtain gas, for example, cap 31 is removed and the control coupling 31 carrying the regulator tube 41 is screwed on in place. This causes the rounded end of tube 4:1 to press on disk 2S which is moved inwardly and its motion is transmitted through the releasing balls to the valve nut, valve stem and head to thereby open the valve. A turn ot the coupling will release the pressure and the valve will immediately be reseated aided by the spring as well as by the gas pressure.

IVhile, for the purpose of illustration, I have shown three releasing members 27 in the form of balls, it is obvious that any number of balls, or equivalent members, may be used, and in all cases will the valve stem and valve head be moved in straight lines and no displacing twists will be imparted thereto.

It is further obvious that by my construction gas may be discharged at any desired angle, and at the same time the valve may be regulated from this distant point by lan extension of my releasing and control mechanism. In Fig. 4 I have illustrated one type of extension as an illustration of extending the principles of my invention. In this eX.- tension the coupling nut 86 carries a coupling tube 3S to which may be connected an extension tube 39 ofany desired shape and lengt-h. If a plurality of changes of direction are. desired, a plu 'ality of pressure direction changing members will then be employed at the points where changes of direction occur. In the present form of extension I have shown but one change in direction of tube 39, and at this point I provide any suitable number of balls 27, or equivalent members. Vithin the tube 38; there is fitted an elongated pressure disk 40, similar .in construction to disk QS, on which one of said members presses. An extension rod 40 may be used in place of the balls or equivalent members for straight line extension, andthis extension may be connected directly to disk 2S for regulating the valve by varying the pressure of member l-l and coupling 3l.

A protective tube 42, provided with a suitable screen lS, protects the valve from within against impurities or rust particles, and the entire valve structure may be screwed into a neck 44 of any suitable gas container, as an oxygen or an acetylene cylinder, for which my valve isfwell adapted. A safety vent 46 filled with low melting composition may be provided.

While I have disclosed a specific embodiment of my invention, I do not thereby desire to be understood as having thus limited myself unduly, as various modifications falling wholly within the spirit and scope of other' end of said passage, and contacting members insaid extension passage, said contacting members being disconnected and freely movable to each other at varying angles for moving said valve head in rec-- tilinear directions.

2. A check valve comprising a valve releasing member and a valve holding member with a valve extension member thereinbetween, said members being provided with a central bore therethrough to forni a continuons passage, a valve seat and a valve head located without said valve holding member but obstructing one end of said passage, a freely movable disk located .in the other end of said passage, and disconnected contacting menibe-rs in the passage of said extension mo iable freely to each other for moving said valve head .in rectilinear directions at an angle to the rectilinear motion of said disk.

In a high pressure selfclosing pressure valve, a valve holding part l'iaving a spring seat therein, a spring in said seat and a valve stem in said spring, a valve stem nutl on one end of said stein and a valve head at the other, a valve plug having a valve seat for said head located beyond the holding part, a valve extension on said holding part, a freely movable pressure transmitting disk in the free end of said extension and pressure transmitting members in said valve extension between said valve stem nut and said pressure transmitting disk.

In testimony whereof I have hereunto set my hand on this 18th day of September, A. D., i922.

CHARLES MELDAU. 

